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Why a 1997 Toyota corolla brake pedal is soft when the engine is running and when the engine is off pedal is firm what could cause this?
Wiki User
∙ 15y ago
Posible air in the brake line system.
The behavior you described is normal operation. The brake cylinder is power assisted by engine vacuum. When the engine is off you don't have vacuum or the power assist. When the engine is started, the pedal will immediately soften up as the vacuum comes online.
Wiki User
∙ 15y ago
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